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The CSP segment contains information on a patient's status for a particular phase of the study. This segment is optional and is useful when a study has different evaluation intervals within it. (See section 7.8.1, "HL7 Attribute Table – CSR – Clinical Study Registration," and section 7.6.1.2, "Phase of a clinical trial:.") The CSP segment is implemented on a study-specific basis for messaging purposes. The fact that the patient has entered a phase of the study that represents a certain treatment approach may need to be messaged to other systems, like pharmacy, nursing, or order entry. It is also important to sponsors and data management centers for tracking patient progress through the study and monitoring the data schedule defined for each phase. It may subsume OBR and OBX segments that follow it to indicate that these data describe the phase.

HL7 Attribute Table - CSP - Clinical Study Phase Segment

Seq#	DataElement	Description	Must Implement	Flags	Cardinality	Length	C.LEN	Vocabulary	DataType
CSP
1	01022	Study Phase Identifier	SHALL		[1..1]			0587	CWE
2	01052	Date/time Study Phase Began	SHALL		[1..1]				DTM
3	01053	Date/time Study Phase Ended			[0..1]				DTM
4	01054	Study Phase Evaluability	MAY True: False:	C	[1..1] [0..1]			0588	CWE

(Definition from CSP.1 in Ch. 7)

Definition: This field identifies the phase of the study that a patient has entered. The set of codes will generally be developed for each clinical trial, although there are patterns that trials in particular disease or prevention categories may follow. The phase structure will be based on data collation and reporting needs for the study. It is an operational structure and need not be discussed in the clinical trial protocol documentation or even made known to patient care or data collection personnel. The coding system will usually be developed by the sponsor for multicentered clinical trials to standardize the receipt of automated data. Local codes could be added if an additional local message is desired. Otherwise, local coding conventions will be used. Refer to Table 0587 - Study Phase Identifier in Chapter 2C for valid values.

Example:

2^Init Rx, Crs 1^NCI T93-0807 Phases

(Definition from CTI.2 in Ch. 7)

Definition: This field identifies the phase of the study that a patient has entered. See CSP-1 Study Phase Identifier for details of coding systems. Refer to Table 0597 - Study Phase Identifier in Chapter 2C for valid values.

(Definition from CM1.2 in Ch. 8)

Definition: This field should correspond to the study phase ID coding system in Chapter 7, section 7.7.2.1, "Study Phase ID."

Definition: This field contains the date the patient began this phase interval. The time is optional.

Definition: This field contains the date the patient ended this phase interval.

Definition: This field contains the disposition of the patient's data for this phase interval for quality control and data analysis purposes. The set of codes will vary across clinical trials. An example answer set: Complete, Adverse Events Only, Outcome Only, None, Unknown. Refer to Table 0588 - Study Phase Evaluability in Chapter 2C for valid values.